diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2017-05-13 21:39:49 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-09 20:01:24 +0200 |
| commit | d2f96e17ca75f183cfd50ff0b6655fb74e502a1e (patch) | |
| tree | 38401c44feb8fa6361e82e499872bb5e3867b9ff /arch/alpha | |
| parent | b68377cb57f248cafc3b118e78adeb60a6d442d5 (diff) | |
osf_getdomainname(): use copy_to_user()
commit 9ba3eb5103cf56f0daaf07de4507df76e7813ed7 upstream.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/alpha')
| -rw-r--r-- | arch/alpha/kernel/osf_sys.c | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c index 4f95577b0180..ddba64b46fe1 100644 --- a/arch/alpha/kernel/osf_sys.c +++ b/arch/alpha/kernel/osf_sys.c @@ -561,25 +561,20 @@ SYSCALL_DEFINE0(getdtablesize) */ SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen) { - unsigned len; - int i; + int len, err = 0; + char *kname; - if (!access_ok(VERIFY_WRITE, name, namelen)) - return -EFAULT; - - len = namelen; - if (len > 32) - len = 32; + if (namelen > 32) + namelen = 32; down_read(&uts_sem); - for (i = 0; i < len; ++i) { - __put_user(utsname()->domainname[i], name + i); - if (utsname()->domainname[i] == '\0') - break; - } + kname = utsname()->domainname; + len = strnlen(kname, namelen); + if (copy_to_user(name, kname, min(len + 1, namelen))) + err = -EFAULT; up_read(&uts_sem); - return 0; + return err; } /* |